Stone-sawing machine.



PATENTED APR. 4, 1905.

0. w. ALSTON. STONE SAWING MACHINE.

APPLICATION FILED MAR.11, 1902.

IN VENT 0f? 0%??4422;

WITNESSES UNITED STATES Patented Apri14, i905.

PATENT OFFICE.

STONE-SAWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 786,339, dated April 4,1905. Application filed March 11,1902. Serial No. 97,760.

To all whom it may concern.-

Be it known that I, OSCAR W. ALSTON, a citizen of the United States,residing at Lanesboro, Susquehanna county, State of Pennsyl- Vania, haveinvented a new and useful Improvement in Stone Sawing Machines, of whichthe following is a specification.

My invention relates to improvements in stone-sawing machines.

It has, primarily, for its object to impart to the saw-carrying means orcontrivance practically a right-lined or rectilinear movement, thedesirability of which is obvious, and

q to effect or secure that end in a simple and effective Way.

Said invention consists of certain structural features substantially ashereinafter more fully disclosed, and specifically pointed out by theclaims.

In the accompanying drawings, illustrating the preferred embodiment ofmy invention, Figure l is a broken sectional elevation of the latter,with the saw-carrier and its suspending means in the position theyassumeat the limit of their movement in one direction. Fig. 2 is a brokenfront view of the same. Fig. 3 is a detailed sectional elevation showingin full lines the medial position of the saw-carrier-suspending meansand in dotted lines the limit of the movement or position of the samewhen moved in the opposite direction to that disclosed by Fig. 1.

In the carrying out of my invention I provide a suitable upright frameE, upon opposite suitablyprovided surfaces of whose standards are guidedor arranged slides or blocks H, vertically adjustable and carried byvertical screws P. adapted to be suitably held and actuated in saidstandards, as well understood by those familiar with this art, but whichscrews and their actuating means need not be further elaborated herein,as the same constitute no part of my invention.

The saw carrier or frame R, having suitably secured thereto and at therequired points thereon upstanding ears or lugs C, is supported inposition and suspended from the slides or blocks H by means of hangersA, suitably pivoted, as at I, at their lower ends to said ears or lugsand having connection at their extreme upper ends to two cranked links FG and at a short distance downward therecally in right lines,consequently imparting a corresponding movement to the saw carrier orframe, the desirability and purpose of which are obvious. It is obviousthat as the lower ends of the hangers arrive at the end of their strokein one direction (see Fig. 1) the cranks F G. forced sidewise orlaterally, gradually lower, so that the point 1 has traveled in a rightline to the end of the stroke, which, however, being limited at thisjuncture by the restraining action of the cranks, rises until the centerof motion has again been reached, when after passing the same said pointcommences to lower, so as to retain the saw-carrier in a right lineuntil it reaches a point where the restraining action of said crankscauses a rise or lift, as disclosed by the dotted lines of Fig.

3, which completes the stroke. Reciprocation now being initiated causesthe saw-carrier to retrace its former line of travel. By means of thisarrangement of parts it will be observed that a short or slight lift ofthe saw carrier or frame is permitted at one or more points during theoscillation or swinging movement of the hangers to allow cuttingmaterial to get under the saw-blades and to do this without the use ofhorizontal slides in order to avoid all possible friction.

Said invention may be readily applied to any ordinary sawing-machine andcombines the merits of the straight-cut and the antifriction qualitiesof that class of machines employing the swinging 0r pendulum-likeactuated hangers now in use.

Latitude is allowed as to details herein, as

they may be changed as circumstances suggest without departing from thespirit of my invention and the latter still be protected.

I claim- 1, The combination, with standards,of slides adjustablethereon; arms pivoted to the slides; hangers articulated to the arms;links pivoted to the hangers and also to the slides; and a saw-framepivoted to said hangers.

' 2. The combinatiomwith standards, of slides adjustable thereon andhaving sides facing each other; arms pivoted to the upper portions ofsaid slides; hangers articulated to the arms; links pivoted to thehangers and to the lower parts of the slides; and a saw-frame carried bythe levers.

3. The combination, with frameworkhaving uprights, of a saw-framemounted for swinging movement between said uprights; slides fitted foradjustment upon guideways of the uprights; hangers articulated to thesawframe; links pivoted to the slides, and also pivoted to the hangersintermediate their lengths; and of such proportions that they will causethe saw-frame to be lifted on each stroke; and arms pivoted to theslides above the links and articulated to the ends of the hangers.

4:. In a machine of the class described, the combination, with amachine-frame having vertical uprights, of slides fitted upon guidewaysof said uprights; means for adjusting said slides; hangers articulatedto the sawframe; links pivoted to the lower portions of the slides ontheir inner sides and also pivoted to the hangers intermediate thelengths of said hangers; arms pivoted to the inner portions of theslides and also articulated to the upper ends of the hangers; and meansfor reciprocating said saw-frame.

5. In a machine of the class specified, the combination, with asaw-frame, of hangers pivoted to said frame; upwardly-inclined links ofa length to cause the saw-frame to be lifted on each stroke, connectedto the hangers at points intermediate their lengths; slides to the lowerends of which said links are pivoted; and downwardly-inclined armspivoted to the upper ends of said slides and also to the upper ends ofsaid hangers.

6. The combination of the standards, vertically adjustable slidesarranged upon said standards, a saw-carrying frame, pairs of linksbearing in said slides and arranged to stand normally, one pair at rightangles to the other and having pivotal connection with said hangers at,and near, their upper ends, said hangers having like connection at theirlower ends with said saw-carrying frame.

Signed by me this 4th day of March, 1902.

OSCAR W. ALSTON.

Witnesses:

C. J. JOHNSON, HENRY A. BENNETT.

